The SmartMountTM PLB-1 Back-to-Back Ceiling Mount works with all 1.5" NPT extension pipes for versatility, support, and connection. The 1.5" NPT threaded pipes make it simple to customize each mount to your specific application. The Back-to-Back Ceiling Mount can be used in conjunction with Peerless-AV®’s AEC or EXT columns, along with the PLP adaptor plates for custom ceiling mount applications. Each side of the tilt box provides -5° to 2° of forward tilt, and 36° of swivel, making it possible to find the perfect viewing angle. Not compatible with AEC69, EXT2 and EXT6 extension columns.